Diffractive indicia for a surface
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United States of America Patent
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Jun 15, 1999
Grant Date -
N/A
app pub date -
Apr 12, 1996
filing date -
Nov 23, 1993
priority date (Note) -
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Abstract
Diffractive indicia for a surface (1) comprising a plurality of small separate diffractive elements (2) and means for a adhering the diffractive elements to the surface. Each diffractive element has a diffractive surface relief structure and is not separately resolvable to the human eye. The appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes. In preferred arrangements, the diffractive indicia, are incorporated in an ink or a transfer medium. A palette of diffractive indicia with different characteristic colours and other optical properties may be provided.
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